Comments extract

comment.rb

class Comment < ActiveRecord::Base

  hobo_model # Don't put anything above this

  fields do
    body :text, :required
    timestamps
  end

  belongs_to :commentable, :polymorphic => true, :counter_cache => true
  belongs_to :owner, :class_name => "User", :creator => true

  named_scope :recent, lambda { |n| { :order => 'updated_at DESC', :limit => n } }

  set_default_order "created_at DESC"

  # --- Permissions --- #

  def create_permitted?
    owner_is? acting_user
  end

  def update_permitted?
    acting_user.administrator?
  end

  def destroy_permitted?
    acting_user.administrator?
  end

  def view_permitted?(field)
    true
  end

  # other methods
  def shortened_body
    return body.slice(0,100) + "..." if body.length > 100
    body
  end
end

comments.dryml

<def tag="card" for="Comment" attrs="gravatar">
  <div class="card linkable comment" param="default">        
    <gravatar:owner unless="&gravatar == 'false'" rating="pg" size="50" param />
    <h5 param="card-heading"><You:owner /> wrote <view:created_at format="on %B %d, %Y at %I:%M%p" param="card-timestamp" />:</h5> 
    <p><view:body param="card-body" /></p>
    <delete-button class="actions" param />
  </div>  
</def>

<def tag="comment-collection">
	<% cache :controller => :comments, :action => :commentcollection, :commentable_type => this.class, :commentable_id => this.id do %>
		<div part="comment-collection">
			<collection:comments />
		</div>
	<% end %>
	<add-comment if="&current_user.signed_up?" />
</def>

<def tag="add-comment">
  <do with="&this.comments.new :owner => current_user">
    <form update="comment-collection" reset-form>
      <h6>Add a comment</h6>
      <input:body class="comment-body-input" />
      <after-submit uri="&object_url(this.commentable)" />
      <submit label="Add Comment"/>
    </form>
  </do>
</def>

in application.dryml

<extend tag="show-page">
	<old-show-page merge>
		<append-content-body:>
			<section class="collection-section" if="&this.respond_to?(:comments)">
				<h3 class="collection-heading">Comments</h3>
				<comment-collection />
			</section>
		</append-content-body:>
	</old-show-page>
</extend>

in some_model.rb

  has_many :comments, :as => :commentable, :dependent => :destroy, :accessible => true